Stack blower



Aug. 25, 1 J. MCCLINTON STACK BLOWER Filed Nov. 5,1940

Patented Aug. 25, 1942 UNITED STATES ATET QFFICE STACK BLOWER John McClinton, Houston, Tex., assignor of fifty per cent to Thomas N. Hunt, Houston, Tex.

3 Claims.

The invention relates to a stack blower, and particularly of a type wherein the blower can be readily positioned in the stack and aligned and adjusted.

It is one of the objects of the invention to provide an adjustable stack blower wherein the volume of fluid discharged can be controlled.

Another object of the invention is to provide an adjustable head for stack blower nozzles.

Still another object of the invention is to provide a pipe support for stack blowers wherein the pipe is .curved so that the alignment of the blower within the stack can be determined by the direction of the pipe projecting from the stack.

Another object of the invention is to provide a stack blower which can be installed while the boiler is in operation.

It is also one of the objects of the invention to provide an attaching means for stack blowers whereby the blower may be inserted in the pipe and dropped into position in an opening in the wall of the stack.

Other and further objects of the invention will be readily apparent when the following description is considered in connection with the accompanying drawing wherein:

Fig. 1 is a diagrammatic arrangement of a boiler stack and blower assembly.

Fig. 2 is an enlarged vertical sectional view of the stack and the blower illustrating the adjustable features of the nozzle and the mode of supporting the blower in the stack.

Fig. 3 is a transverse section taken on the line 3-3 of Fig. 2.

In Fig. 1 the boiler 2 is provided with a stack 3 to carry away the products of combustion in heating the boiler. In the oil fields, particularly where this invention may be utilized, a battery of three boilers are arranged side by side so that three of the stack blowers may be used, one on each boiler stack and a common supply pipe or manifold used :for all of the stack blowers.

The stack 3 may be of any desired length but it has been found that with this stack blower the stack need not be as long or high as would be otherwise required.

The blower 4 is inserted in an opening 6 in the side of the stack and the valve 1 may be applied to the supply pipe 5 to control the flow of air or steam to the blower.

It is intended that the blower can be applied to the stack 3 while the boiler is in operation and while the products of combustion are flowing through the stack. Thi may be accomplished :by cutting the opening 6 in the stack with a welding torch or other instrument and the blower inserted through the opening.

The blower is of a particular construction which is best seen in Fig. 2 wherein a slightly different form of the pipe 5 has been shown. In this form the pipe 5 has a straight section 9 with an upwardly turned end Ill to which the nozzle or body member I I is connected. The other end of the pipe 5 beyond the center portion is downwardly turned at I2 and it should be particularly noted that the ends l0 and [2 are intended to be in vertical alignment so that the position of the end l2 indicates the position of the end Ill inside of the stack. Thus if the end I 2 projects vertically downward the operator knows that the end I0 is projecting directly upward and that the nozzle II is then properly .centered or positioned in the stack.

In order to attach the blower to the stack, an opening 6 is made in the side wall of the stack in any desired manner. Such opening will ordinarily be two inches in diameter. This opening is of a size to admit the flange I6 which is semicircular and formed on the lower half of the center section 9 of the pipe 5. Thus the blower and the pipe end IE] will be inserted through the opening 6 so that the flange l6 moves in through the opening. The pipe is then dropped down slightly so that the wall portion l8 of the stack will be received between the flange l6 and the outer flange I! which is also formed onthe portion 9 of the pipe. In this manner the blower will be firmly held in position and it will be observed that the flange I1 is of sufiicient size to cover the opening 6. Ordinarily the blower will remain in this position by gravity but if desired suitable metal screws 20 may be passed through the flange I1 and the wall of the stack so as to affix the blower. In moving the stack and blower it is only necessary to disconnect the supply pipe and leave the blower attached to the stack.

The nozzle H is of particular construction in that it has a base portion 21 threaded at 22 onto the end ID of the pipe 5. This base 2| has a choke passage 23 therethrough which is of restricted diameter as compared with the .pipe 5. This passage 23 serves to restrict the volume of steam which may be discharged and serves to increase the rate of flow at the nozzle and has an upwardly tapered or flaring end 24 which extends through the end of the base.

The outer upper end of the base is reduced in diameter and threaded at 25 to receive the skirt portion 26 of the nozzle head 21. This head is of a peculiar construction in that it has a lower semicircular skirt portion 26 from which project the legs or braces 28 three of which are shown in section in Fig. 3. These legs serve to carry a pointed deflector portion 30 which forms part of the head 21. This deflector has the lower pointed end 3| thereof projecting into the tapered portion 24 of the passage 23 so that an annular opening 32 is thus provided around the deflector point 31,

The opening 32 may be adjusted as to size by turning the head 21 on threads 25 because this turning either raises or lowers the deflector 30 relative to the base so as to space the deflector either closer to or farther from the taper 24.

Attention is directed to the streamlined configuration of the legs 28 so as not to interfere with the discharge of air or steam through the nozzle. In this manner a uniform distribution of the blower fluid is obtained.

Broadly, the invention contemplates an adjustable stack blower which may be readily positioned or removed in thestack, or which can be properly aligned in position.

What is claimed is:

1. The combination-of a stack having an opening in the wall thereof, a stack blower including a pipe, a semicircular flange on the lower side of said pipe to be passed through said opening and to seat on the inside of the stack, and another flange on the pipe to engage the outside wall of the stack to retain said blower in position, so that when the pipe is lowered after the insertion of said first flange the blower will be anchored to the stack.

2. The combinatiofiof a stack having an opening in the wall thereof, a stack blower including a pipe to pass through said opening, a continuous radially extending flange on said pipe adapted to engage the surface of the stack about said opening, and a segmental radial flange on said pipe spaced from said continuous flange and adapted to pass through the opening and seat on the opposite side of the stack wall from the continuous flange when the pipe is lowered relative -to the opening whereby the stack blower is held in operative position within the stack.

3. A stack blower comprising a body member having an axial choke passage convergingly tapered at its upper end for passage of a stream of pressure fluid, a threaded peripheral area on said member at its upper end, a deflector member including an interiorly threaded skirt portion engaging said threaded area for relative movement of the deflector and nozzle members, a plurality of upstanding legs on said skirt portion and a downwardl tapered nozzle head attached to said legs at their upper ends, said nozzle head extending into the tapered portion of the choke passage and adjustable relative to the nozzle member by relative rotation of the deflector .and nozzle members.

JOHN MCCLIN'I'ON. 

